Standard

Steel, diamond frame uses twin 64 mm x 30 mm elliptical spars. Its rigidity balance has been specifically tuned – it’s much stiffer around the headstock and more ‘flexible’ in the spar sections – to deliver desirable handling characteristics and a high level of rider feedback.

The swingarm pivot plate is forged then welded together, while the gravity die-cast aluminum swingarm arcs up over the muffler on the right. The single-tube monoshock offers 7-stage spring preload adjustment and operates directly on the swingarm.

The shock and 41 mm telescopic fork have been developed to work directly with the CBR650F frame’s performance parameters to provide supple, neutral control in all conditions. Firmer spring rates (with damping to suit) match the bike’s more sports-oriented focus.

Wavy brake discs use the same manufacturing technique as the twin-cylinder NC750 series; the 240 mm rear is formed within a 320 mm front, saving material (and ultimately cost) to the customer. The two-piston front and single-piston rear calipers are managed by standard 2-channel ABS, ensuring safe and consistent stopping in most conditions.

Engine/Drivetrain

Standard

Optimization of con-rod length has decreased the side-force on each piston and ‘breathing’ holes in the crankcase walls between journals reduce pumping losses as rpm rises. The pistons feature asymmetric skirts minimizing bore contact to reduce friction further and ferrous spines on the outer surface of the cylinder sleeves reduce oil consumption and improve heat transfer.

The water pump – designed with CAE study of water flow – is compact and efficient, reducing drag.

Internal water channeling from cylinder head to cylinders reduces the number of external hoses allowing the motor to show off its minimal, elegant beauty and functional style.

Peak power arrives at 11,000 rpm with peak torque at 8,000 rpm for a broad usable powerband. The engine is smooth at all rpm, with distinct inline four-cylinder character and resonance.

To ensure good fuel economy at constant throttle short valve overlap timing works in harmony with a specific ignition map. Range can exceed 350 km per tank.

The liquid-cooled engine uses compact internal architecture, with a stacked six-speed gearbox and starter/clutch layout. The four cylinders are canted forward 30 degree to lower centre of gravity.

A down-flow airbox and narrow 30 mm high-velocity funnels, route intake airflow in as straight a line as possible. The PGM-FI fuel injection system operates with information from four separate throttle body sensors on 32 mm throttle bores for crisp and accurate throttle response. Careful siting and angling of the throttle bodies allows a narrow frame width, improving manageability for the rider.

Transmission

Standard

Six-speed transmission

Final Drive : #525 O-ring-sealed chain

Additional Features

Standard

The riding position is on the relaxed side of sporty and passengers get an ample seat and a grab strap for security.

The dash includes twin large digital screens. On the left are the rev-counter and speedometer; on the right are a fuel gauge, clock, odometer and warning lights. Both sides are lit by a white back light.

Mass Forward’ styling gives the CBR650F its sleek and aggressive appearance. The dynamically curved fuel tank and chiseled fairing add a strong identity, as does the stubby, shrink-wrapped tail unit. Hinged at the back the tank allows easy access to the cylinder head for maintenance. Both taillight and front position light are LED.